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Comprehensive Income (Tables)
 3 Months Ended
Mar. 31, 2013
Schedule of Accumulated Other Comprehensive Income (Loss)
Details of the changes in the components of consolidated accumulated other comprehensive income (loss) (AOCI), net of income taxes, as reported in Questar's Condensed Consolidated Balance Sheets, are shown in the table below. The table also discloses details of income taxes related to each component of OCI.
 
Pension and OPRB
 
Interest rate cash flow hedges
 
Long-term invest.
 
Total
 
Pension and OPRB
 
Interest rate cash flow hedges
 
Long-term invest.
 
Total
 
3 Months Ended
 
12 Months Ended
 
March 31, 2013
 
March 31, 2013
 
(in millions)
AOCI at beginning of period
$
(223.2
)
 
$
(23.2
)
 
$
0.1

 
$
(246.3
)
 
$
(202.8
)
 
$
(23.4
)
 
$
0.1

 
$
(226.1
)
OCI before reclassifications
—

 
—

 
—

 
—

 
(33.0
)
 
—

 
0.1

 
(32.9
)
Reclassified from AOCI(1)
—

 
0.2

 
—

 
0.2

 
—

 
0.5

 
—

 
0.5

Income taxes
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
OCI before reclassifications
—

 
—

 
—

 
—

 
12.6

 
—

 
(0.1
)
 
12.5

Reclassified from AOCI(2)
—

 
(0.1
)
 
—

 
(0.1
)
 
—

 
(0.2
)
 
—

 
(0.2
)
Total income taxes
—

 
(0.1
)
 
—

 
(0.1
)
 
12.6

 
(0.2
)
 
(0.1
)
 
12.3

Net other comprehensive income (loss)
—

 
0.1

 
—

 
0.1

 
(20.4
)
 
0.3

 
—

 
(20.1
)
AOCI at March 31, 2013
$
(223.2
)
 
$
(23.1
)
 
$
0.1

 
$
(246.2
)
 
$
(223.2
)
 
$
(23.1
)
 
$
0.1

 
$
(246.2
)


(1) Amounts are included in their entirety as charges to interest expense on the Consolidated Statements of Income.
(2) Amounts are included in their entirety as credits to income taxes on the Consolidated Statements of Income.